Stylus-bar mounting



H. J. DURBOROW. STYLUS BAR MOUNTING.

APPLICATION FILED JULY 16,1920

Patented May 17, 1921.

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. To all whom: it may concern:

Philadelphia, in the county of Philadelphia 7 boxes of talkingjma'chines, which will be so constructed and balanced that it will more I Be it known that I, HARRY J. Duneonow, acitizen of the United States, resldi'ng'at and State of Pennsylvania, have invented certain new and usefulj lmprovements 1n Stylus Bar Mountings, of which the following is a specification.

One object ofmy-in 'fention is to provlde an improved stylus bar mounting for sound efiectively and accurately transmit vibrations from the reproducing needle to the diaphragm than other devices for this purpose which have been made prior: to my present invention. I r

. Another object isto so-make the' parts em I bodying my present invention-that they can be easily and'quickly' put tog etheror taken I apart. I

A further object is toimake the device of my present invention of a'durahle and comparatively simple construction 'which will not accidentally get out ofworking order. These objects, and other advantageous .ends which will be described hereinafter, I attain in the following manner, reference being had to the accompanying drawings in which- Figure 1 1s a front elevation sound box having a stylus 'a-rm mounting-made in Referring to the drawings, 5 represents a sound box which includes a diaphragm casing 6 having a diaphragm 7 mountedtherein. The casing 6 has a lug or projection 8 extending therefrom; said lug preferably havlng a plane surface 9 as clearly shown in Figs. 1, 2 and 3. A plate 10 is arranged substantially parallel with and spaced from thev surface 9 of the projection 8 and from'one side of this plate projects the stylus bar 11;

said stylus bar being connected centrally" with the diaphragm 7 as shown at 12. The stylus bar plate 10 has a needle chuck 13 extending therefrom; said needle chuck being arranged centrally within the width of the plate 10 and also preferably arranged cen- These holes'16 are preferably arranged centrally within the width of'the' platelO and through the respective. holes 16.

screws are of smaller diameterfthan the, diaameter of the holes 16 and extend through r of. .In other words the screws 17 do-not touch the plate 10.v .The'screws :17 have heads 1-7 at their lowerends and are spaced below the springs. Each of the springs '18 hasop- :posed bent or looped 'portions'21 at 'ei'ther side. of the central-portion 19 ;:said3looped Specification of Iletteirs Patent.

1 1 s a; filed Ju1y 16,"1920.. -Seria11 1'o. 396, 6? 3. I 8' j trally-within the length ofthe plate 10 as clearly shown in Figs. 2jand lhe chuck 13 is-adapted to support 'thereproducing needle 14 and a set screw provided for this purpose. v The stylusbar plate 10has holes 16 ex- 15 is preferably tending through its thickness; said holes be 1 ,ing spaced-apart within thelengthof the platelO at eithersideof thechuck '13.

directly under the-middle of the thickness of the projection8 as'shownin Fig.2.

Securing devices in the form of screws17 are screwed'into-theprojection, 8 and extend These said holes withouttou'ching the'walls therethe bottom of the plate 10-. "Two springs 18 are each similarly formed "and preferably made of strap. spring steel having centrallower surfaces of the centralg portions 19 of portions being preferably of equal size and strength and terminating in ends 22 "which are secured to the top of the plate 10 by screws 23 so that the looped portions 21 surround the side edge portions 24: of the plate 10 as clearly shown in Fig. 2. 'The screws 17 extend centrally within the thickness of the projection 8 and are also located at equal distances from the opposite sides of the nee-' dle chuck 13. Each of the looped portions 21 of the springs 28 haveparts whichare located at a lower level than the central portion 19' and the top of the'plate 10 is provided' with recesses 25 which are of substantially conical formation. Theserecesses 25 are located at opposite sides of the screws 17 and are included in a plane which passes through the axes of the screws 17 and chuck .13; said plane also extending centrally through the central portion 10 of the springs '18 betweenthe looped portions 21 thereof.

Fulcrum studs 26 have their upper ends V screwed in the projection 8 and their lower j 8O portions 19provided with holes 20 through I which the screws 17-res'pectively extend so i that-the. heads 17 of the screws enga'gethe.

ends are made conical and fit central within the respective recesses 25. The plate 10 is "supported onthe'springs 15 and the recesses and studs form fulcruming points which are the only means of contact between the diaphragmcasing and the plate. By making the spring of the shape described and illustrated equal tension will be imposed upon opposite sides of the plate 10 and the parts will be balanced and any vibrations from theneedle will be transmitted to the stylus 1 bar and the springs will serve to accurately .return the parts to their normal .positions.

One of the most. important advantages of my improved'stylus bar support is that there is practically no chance for setting up foreign vibrations since the only means of direct contact is through the medium of the spring and fulcruming studs and recesses.

Furthermore the parts can be easily put together and taken apart.

While I have described my invention as taking a particular form, it will be understood that the various parts of my invention may be changed withoutdeparting from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that I am at liberty to make such changesand alterations as fairly come within the scope of the appended claims.

Havingthus described my invention, what I claim as new and desire to secure by Let- 'ters Patent is V 1. The combination with a sound box having a diaphragm casing and a diaphragm therein, of a'stylus bar mounting including a plate having a stylus bar'extending therefrom for attachment with the diaphragm; 1

, means providing'a fulcruming contact between the plate and the casing; springs having looped end portions connected to said plate and centralportionsbetween said .of-said springs being included in a I passing through the middle of the width of 7 looped portions; and means for connecting said central portions to said casing indea plate having a stylus bar extending therer from for attachment with the diaphragm; means providing a fulcruming contact between the plate and thecasing; springs having looped end portions connected to'ysaid plate and central portions between said: looped portions; holes within said plate;

and screws connectingsaid central portions of the springs with the casing and extending through said holes, said screws beingout of contact with the walls ofsaid holes; substantially as described.

The combination with a sound box, havinga diaphragm casing and adiaphragm therein, of a stylus bar mounting including a plate having a stylus bar extending therefrom for attachment with the diaphragm;

means providing a fulcruming contact between the plate and the ,casing; having looped end portions connected to said .plate, and central portions between said I looped portions; and means for connecting said central portions to 'saidcasingindependently of said plate, the central portions plane said plate; substantially as described;

springs V In testimony whereof I have signed my name to this specification in the presence of two subscribing wltnesses.

Witnesses: V

Anerrs'rus B. Corrns,

"CHAS. E. Po'rrs.

HARRY" J. D'URBOROW. 

